Free.
Not just with closing time. Don't frame it that way. I don't care about usage. You know they are free. Some people just have common decency and etiquette and don't want their wins to come from having a fusion plastered to their hand.
Make them projectile and not hitscan if you cannot always sync the sound of it charging with what's actually happening in game.
For every reason you offered for nerfing shotguns outside of usage, you ignore that on fusions.
Edit
What other special can be used exclusively as your primary other than Forerunner and Fusions? Why when it was a problem for shotties and that side arm something needed to be done, but it's fine for fusions?
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Pretty sure one of the reasons they stated for making fusions hit scan was because of either the inconsistent hit registration that came with them being projectiles, or to make range less important as I'm pretty sure range affected their travel speed. And considering how buggy the game is now, I'd be more surprised if this didn't either butcher every fusion archetype except high impacts (probably another reason for the buff) or it somehow breaks Vex Mythoclast in some way. Better to just leave it alone.